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Miniaturized and Bandwidth Improvement of Bandpass Filter using A Quarter Wavelength Resonator

Jurnal Teknik Elektro · Vol. 17 No. 1 (2025) · pp. 7–11

DOI
10.15294/jte.v17i1.32473
ISSN
2549-1571, 1411-0059
Published
2025-11-10
Publisher
LPPM Universitas Negeri Semarang
Language
eng

Abstract

The miniaturization of radio frequency (RF) and microwave filters is crucial in modern communication systems, particularly in space-constrained environments such as portable, wearable, or integrated multi-band platforms. In this study, a compact single band-pass filter (BPF) is proposed using an L-shaped resonator loaded with a via-through hole. The incorporation of the via allows the creation of a quarter-wavelength resonator, which significantly reduces the physical size to 44.6% compared to traditional half-wavelength resonators commonly used in band-pass filters. Additionally, the via contributes to an improved impedance bandwidth. Two L-shaped resonators are arranged in a back-to-back configuration to realize a second-order filter response. The structure is excited through a stub-loaded transmission line that couples the signal from port one to port two. To validate the proposed design, the filter was fabricated and measured. Experimental results demonstrate a -3 dB fractional bandwidth (FBW) exceeding 25% at the centre frequency of 3.2 GHz, with a measured insertion loss of -1.662 dB across the passband, indicating good performance for compact filter applications.

Keywords

Collaboration network of the authors

26 authors · 75 co-authorship links · 23 across different organisations

Hover or tap a name to highlight its co-authors. Double-click to open the author's page.

  • Mercu Buana University
  • Sultan Ageng Tirtayasa University
  • Universitas Halu Oleo
  • Universitas 17 Agustus 1945 Jakarta
  • Pakuan University
  • Indonesia University of Education
  • Tun Hussein Onn University of Malaysia
  • Affiliation unknown
  • Different organisations
  • Same organisation
  • Affiliation unknown
  • Thicker line = more joint articles · bigger circle = more articles
Show as table
Co-authorOrganisationJoint articles
Muslim MuslimUniversitas Halu Oleo3
Syah AlamUniversitas 17 Agustus 1945 Jakarta2
Mudrik AlaydrusMercu Buana University2
Ahmad FirdausiMercu Buana University2
Dian RusdiyantoAffiliation unknown2
Huda A MajidAffiliation unknown2
Teguh FirmansyahSultan Ageng Tirtayasa University1
Supriyanto PraptodiyonoSultan Ageng Tirtayasa University1
Herudin HerudinSultan Ageng Tirtayasa University1
Didik AribowoSultan Ageng Tirtayasa University1
Muchamad YunusPakuan University1
Rizki Ramadhan PutraMercu Buana University1
Muslim MuslimIndonesia University of Education1
Huda A. MajidTun Hussein Onn University of Malaysia1
Galang P. N. HakimMercu Buana University1
Setiyo BudiyantoMercu Buana University1
Beny NugrahaAffiliation unknown1
Yudistiro YudistiroAffiliation unknown1
Iis AndiniAffiliation unknown1
Catur AprionoAffiliation unknown1
Umaisaroh UmaisarohAffiliation unknown1
Puji HaryantoAffiliation unknown1

Affiliations come from OpenAlex; journal OAI-PMH metadata carries none. Authors without an OpenAlex ID are matched by name, which can merge or split people.

Metadata source: OAI-PMH (metadata jurnal) https://journal.unnes.ac.id/journals/jte/oai, first harvested 6 Nov 2026, last seen 8 Nov 2026.
Original metadata (oai_dc) 
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	<dc:title xml:lang="en">Miniaturized and Bandwidth Improvement of Bandpass Filter using A Quarter Wavelength Resonator</dc:title>
	<dc:creator xml:lang="en">Dwi Astuti Cahyasiwi</dc:creator>
	<dc:creator xml:lang="en">Amtsaluddin Zanetti</dc:creator>
	<dc:creator xml:lang="en">Dian Widi Astuti</dc:creator>
	<dc:creator xml:lang="en">Galih Adhi Yoga</dc:creator>
	<dc:subject xml:lang="en">A-Quarter Wavelength Resonator</dc:subject>
	<dc:subject xml:lang="en">Filter</dc:subject>
	<dc:subject xml:lang="en">Miniaturized</dc:subject>
	<dc:subject xml:lang="en">Second-Order</dc:subject>
	<dc:subject xml:lang="en">Via Through-Hole</dc:subject>
	<dc:description xml:lang="en">The miniaturization of radio frequency (RF) and microwave filters is crucial in modern communication systems, particularly in space-constrained environments such as portable, wearable, or integrated multi-band platforms. In this study, a compact single band-pass filter (BPF) is proposed using an L-shaped resonator loaded with a via-through hole. The incorporation of the via allows the creation of a quarter-wavelength resonator, which significantly reduces the physical size to 44.6% compared to traditional half-wavelength resonators commonly used in band-pass filters. Additionally, the via contributes to an improved impedance bandwidth. Two L-shaped resonators are arranged in a back-to-back configuration to realize a second-order filter response. The structure is excited through a stub-loaded transmission line that couples the signal from port one to port two. To validate the proposed design, the filter was fabricated and measured. Experimental results demonstrate a -3 dB fractional bandwidth (FBW) exceeding 25% at the centre frequency of 3.2 GHz, with a measured insertion loss of -1.662 dB across the passband, indicating good performance for compact filter applications.</dc:description>
	<dc:publisher xml:lang="en">LPPM Universitas Negeri Semarang</dc:publisher>
	<dc:date>2025-11-10</dc:date>
	<dc:type>info:eu-repo/semantics/article</dc:type>
	<dc:type>info:eu-repo/semantics/publishedVersion</dc:type>
	<dc:type xml:lang="en">Peer-reviewed Article</dc:type>
	<dc:format>application/pdf</dc:format>
	<dc:identifier>https://journal.unnes.ac.id/journals/jte/article/view/32473</dc:identifier>
	<dc:identifier>10.15294/jte.v17i1.32473</dc:identifier>
	<dc:source xml:lang="en">Jurnal Teknik Elektro; Vol. 17 No. 1 (2025); 7-11</dc:source>
	<dc:source>2549-1571</dc:source>
	<dc:source>1411-0059</dc:source>
	<dc:source>10.15294/jte.v17i1</dc:source>
	<dc:language>eng</dc:language>
	<dc:relation>https://journal.unnes.ac.id/journals/jte/article/view/32473/6792</dc:relation>
	<dc:rights xml:lang="en">Copyright (c) 2025 Jurnal Teknik Elektro</dc:rights>
</oai_dc:dc>